[llvm-branch-commits] [llvm] TTI: Check legalization cost of mulfix ISD nodes (PR #100520)

[Matt Arsenault via llvm-branch-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/100520

None

>From 689ea8720d60ae6fc1226b929f5333adae1ce77c Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Thu, 25 Jul 2024 10:31:04 +0400
Subject: [PATCH] TTI: Check legalization cost of mulfix ISD nodes

---
 llvm/include/llvm/CodeGen/BasicTTIImpl.h | 53 +++++++++++++-----------
 1 file changed, 29 insertions(+), 24 deletions(-)

diff --git a/llvm/include/llvm/CodeGen/BasicTTIImpl.h b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
index 314390aee5085..1a089a3fa9634 100644
--- a/llvm/include/llvm/CodeGen/BasicTTIImpl.h
+++ b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
@@ -2155,30 +2155,11 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
       ISD = ISD::USUBSAT;
       break;
     case Intrinsic::smul_fix:
-    case Intrinsic::umul_fix: {
-      unsigned ExtSize = RetTy->getScalarSizeInBits() * 2;
-      Type *ExtTy = RetTy->getWithNewBitWidth(ExtSize);
-
-      unsigned ExtOp =
-          IID == Intrinsic::smul_fix ? Instruction::SExt : Instruction::ZExt;
-      TTI::CastContextHint CCH = TTI::CastContextHint::None;
-
-      InstructionCost Cost = 0;
-      Cost += 2 * thisT()->getCastInstrCost(ExtOp, ExtTy, RetTy, CCH, CostKind);
-      Cost +=
-          thisT()->getArithmeticInstrCost(Instruction::Mul, ExtTy, CostKind);
-      Cost += 2 * thisT()->getCastInstrCost(Instruction::Trunc, RetTy, ExtTy,
-                                            CCH, CostKind);
-      Cost += thisT()->getArithmeticInstrCost(Instruction::LShr, RetTy,
-                                              CostKind,
-                                              {TTI::OK_AnyValue, TTI::OP_None},
-                                              {TTI::OK_UniformConstantValue, TTI::OP_None});
-      Cost += thisT()->getArithmeticInstrCost(Instruction::Shl, RetTy, CostKind,
-                                              {TTI::OK_AnyValue, TTI::OP_None},
-                                              {TTI::OK_UniformConstantValue, TTI::OP_None});
-      Cost += thisT()->getArithmeticInstrCost(Instruction::Or, RetTy, CostKind);
-      return Cost;
-    }
+      ISD = ISD::SMULFIX;
+      break;
+    case Intrinsic::umul_fix:
+      ISD = ISD::UMULFIX;
+      break;
     case Intrinsic::sadd_with_overflow:
       ISD = ISD::SADDO;
       break;
@@ -2413,6 +2394,30 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
                                       CmpInst::BAD_ICMP_PREDICATE, CostKind);
       return Cost;
     }
+    case Intrinsic::smul_fix:
+    case Intrinsic::umul_fix: {
+      unsigned ExtSize = RetTy->getScalarSizeInBits() * 2;
+      Type *ExtTy = RetTy->getWithNewBitWidth(ExtSize);
+
+      unsigned ExtOp =
+          IID == Intrinsic::smul_fix ? Instruction::SExt : Instruction::ZExt;
+      TTI::CastContextHint CCH = TTI::CastContextHint::None;
+
+      InstructionCost Cost = 0;
+      Cost += 2 * thisT()->getCastInstrCost(ExtOp, ExtTy, RetTy, CCH, CostKind);
+      Cost +=
+          thisT()->getArithmeticInstrCost(Instruction::Mul, ExtTy, CostKind);
+      Cost += 2 * thisT()->getCastInstrCost(Instruction::Trunc, RetTy, ExtTy,
+                                            CCH, CostKind);
+      Cost += thisT()->getArithmeticInstrCost(
+          Instruction::LShr, RetTy, CostKind, {TTI::OK_AnyValue, TTI::OP_None},
+          {TTI::OK_UniformConstantValue, TTI::OP_None});
+      Cost += thisT()->getArithmeticInstrCost(
+          Instruction::Shl, RetTy, CostKind, {TTI::OK_AnyValue, TTI::OP_None},
+          {TTI::OK_UniformConstantValue, TTI::OP_None});
+      Cost += thisT()->getArithmeticInstrCost(Instruction::Or, RetTy, CostKind);
+      return Cost;
+    }
     default:
       break;
     }